/*
 * Copyright 2021 DataCanvas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.dingodb.exec.operator.params;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.annotation.JsonTypeName;
import io.dingodb.common.type.TupleMapping;
import io.dingodb.exec.dag.Vertex;
import io.dingodb.exec.operator.hash.HashStrategy;
import io.dingodb.exec.operator.hash.SimpleHashStrategy;
import lombok.Getter;

@Getter
@JsonTypeName("hash")
@JsonPropertyOrder({"strategy", "keyMapping"})
public class HashParam extends AbstractParams {

    @JsonProperty("strategy")
    private final HashStrategy strategy;
    @JsonProperty("keyMapping")
    private final TupleMapping keyMapping;

    public HashParam(HashStrategy strategy, TupleMapping keyMapping) {
        this.strategy = strategy;
        this.keyMapping = keyMapping;
    }

    @Override
    public void init(Vertex vertex) {
        if (strategy instanceof SimpleHashStrategy) {
            ((SimpleHashStrategy) strategy).setOutputNum(vertex.getOutList().size());
        } else {
            throw new IllegalArgumentException("Unsupported hash strategy \"" + strategy + "\".");
        }
    }
}
